WANGZheng-wei,LIUGuang-bo,CHENZe-bin,et al.Detection of MBR Membrane in a Sewage Purification Plant in Guangzhou and Its Cleaning Optimization[J].China Water & Wastewater,2024,40(3):89-94.
Detection of MBR Membrane in a Sewage Purification Plant in Guangzhou and Its Cleaning Optimization
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第3期
Page:
89-94
Column:
Date of publication:
2024-02-01
- Keywords:
- membrane bioreactor; hollow fiber ultrafiltration membrane; membrane fouling; membrane detection; chemical cleaning
- Abstract:
- This paper sampled membrane fibers from a membrane bioreactor (MBR) and conducted a comprehensive test including items such as mechanical strength, pore size distribution and clean water flux to analyze the causes of membrane fouling and optimize the cleaning agent and cleaning sequence, so as to solve the problem of poor cleaning performance of hollow fiber ultrafiltration membrane in a sewage purification plant. The tensile breaking force of the new membranes and the cleaned membranes in use were (4.7±0.9) N and (2.0±0.1) N, respectively, their average/maximum pore sizes were 0.027 8 μm/0.067 6 μm and 0.052 4 μm /0.131 6 μm, respectively, and the contact angles were 99.8°±1.4° and 101.1°±2.4°. There were inorganic scales such as calcium sulfate, calcium silicate and oxides of aluminum, silicon and calcium on the outer surface of the cleaned membranes in use. After the fouled membrane was cleaned with citric acid and oxalic acid, the increase of clean water specific flux [0.66-1.38 L/(m2-h-kPa)] was higher than that of the membrane cleaned with sodium hypochlorite [0.20-0.65 L/(m2-h-kPa)]. The increase of clean water specific flux of the membrane cleaned with first oxalic acid and then sodium hypochlorite [1.73 L/(m2-h-kPa)] was significantly higher than that of the membrane cleaned with first sodium hypochlorite and then oxalic acid [1.19 L/(m2-h-kPa)]. The performance of first oxalic acid cleaning [1.38 L/(m2-h-kPa) increase in clean water specific flux] was slightly better than that of first citric acid cleaning [1.19 L/(m2-h-kPa) increase in clean water specific flux], and the dosage of oxalic acid was significantly lower than that of citric acid. The oxalic acid cleaning followed with sodium hypochlorite cleaning was proposed to improve the cleaning performance and decrease the cleaning cost of fouled MBR membrane with inorganic and organic fouling in similar sewage purification plants.
Last Update:
2024-02-01